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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fbdec1b1896272cc2356095a4e3e6b38068fec19e207fa31177ebc8117278f8' 
  AND token = 'UzwG2FaF4pTwJh6ZtxsMIOqh1nJ/imGGQCfS7JcTRt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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