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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9544fac1e12cf9e7e5b88089bd5c9c39ad5b533e1b4aea57b89fbc5ae4d58b43' 
  AND token = 'r48Hk+wePZsXu9bExa7KQLsG7GIkZ8XlmMgEePxbtyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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