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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0330a9d1e7a436e10e58dffaf53e69f519616c5453e1630d0126325b247d97df' 
  AND token = 'yUaM3eUWTguvj9g4JTh7xU3gYoqM9Nor1ZpE7/7C/gQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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