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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd326fef237c54b6441a272246cc505b7b52e17ddd2e7c71b1f57ace9d1c2d6b8' 
  AND token = 'OhQhebunzlwg7bupJPzTBuEBWieey16OPL1mV4tb38s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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