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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5c351fab0f06dacaf229e898fb4ac57e83329a9f6efffd4677b2f0e724588b5' 
  AND token = 'E1cuMc9Gd0uhA3PdrXUt13+KFpcARHdLUl2TO5G+g3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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