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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '587ad395859f1a053449cf281092a19b0653868e011b77f771ec1a6061fec53d' 
  AND token = '6R1ie3Qy5Z8t38wkrKvKmJAHwIXi2zOcTjDZ9Ppm4+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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