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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '547527aaf84028bb2caddf17f54a6caef3e18e112bdebacb7e471c74b7fea5b7' 
  AND token = '02sIizK7gH9MvfArg0UEESC5suQenBG61ht5S4qq654=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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