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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a11f2bac97912d595bd87f791feffd1c3afac1532533d7275aa459ee3bc149e7' 
  AND token = 'oyVjwjFkvKzDt3cbNp8+l4rl8dZam3E/X6IumaPdZ1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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