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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0876e5e3e37a14fadca07a28dbd64e4113436d09a7ad04d9363935546e5f4f09' 
  AND token = '2celaRQNBk2ygkNevOo1jUESrnfu/Qjwhu1vbQb8LDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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