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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8b3085db5a57b5c955278363d31538c1116c870c6286b756c9c53bb0f12cfaf' 
  AND token = 'sVmyFF2Ce1Wb4EeRvZZyKSdotOQvgkqNVeXAOPH0Wds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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