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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a06d25654bcf8e90088138bc931401c2eb645d7fc9e775e9e762a56ee251d055' 
  AND token = 'Wl6EUNcTbgnqhmeZSF4JAcD6jyhcbqs+CFuW9OLWJY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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