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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4129683844007854d603a1a9d69c9895de2c19d2c0ea6419989e98c278196f92' 
  AND token = 'XriB30XO0mGKoG7o5VeG7XYZzuBfGhFTKgS/LfYc4iA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}