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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8da8a5542c184fc76ed4191bb64f067da04bd14af771369bd523b9ae2fd9692a' 
  AND token = 'FVAhMIqeuFVhnOTIW0VHL7kAsvQSM0Zdk8m9xCyVFVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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