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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e6cd4fe39a2335deff1d1baa687d7b5ef138d031b4803b2d4808c7d4783637b' 
  AND token = 'VIHW5wv0hSqUKE3mEnIrPkQtFULzWLIxarZaqPUHc7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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