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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a45913246306fd46ac1d6993ea41956163f6b12f5e0ade99813adaa7ffb79b6b' 
  AND token = '/s0ZU4aJfX0zDNQAMWremSwwRt1qECwmJLz/0SZ0ZuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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