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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8464eb754c66337252c56d8bae321558b6f0ba94e106c06eac4e5148b36826e6' 
  AND token = 'cCikjQAlg1aC3sRqBygy1Xc30u90dwF7GHT7NAwWWQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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