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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f8e06c73a3b1af79c97804ee697c029eb83ee15fb93896dca992e101a79f2b0' 
  AND token = 'nQ9B7xDDWzSuNGgdQa9pCwFofy0SU8nz5ayp9JsIVR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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