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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c8ff33f5e7d72c417ef1b34cf346dc6f114de2f1a9cb3722f43070496ad15c2' 
  AND token = 'clE7x2E8HJO7gM5Ju1Um3JstXFLCG2NqiE8K8B9XW8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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