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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa97810f07cf20df4ec6d27d2ea73b2bf5d9fde40f1589d2c641d6a438b4b777' 
  AND token = 'h1h77w9sqNjWwnV321g7TjfZ5ctpGFFy4dc4QkJTQ6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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