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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '532e8c33376b3849bc5810febfe7fae3797e49a697957ac14a829d8aedca53da' 
  AND token = 'ScZ8jkj8MucemVXUBgsD8WcOwu7+nCvQfr6MbAFvjGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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