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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d8a8b1b99468950532f68efcd8316a911c958d1c4bb1028b37dae4a2ffab6be' 
  AND token = 'EhNS879zQkkYwCKN6vM8orxlpQf0pKzQCSWg9KAPwx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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