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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '805c7aec4eebb38477e43b9004e0e52c97c207b5f745dc5f33029fcba716868d' 
  AND token = '6pWdawqA93Z54M28V3Xq0yAQvt7qp3W424R8onLqRrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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