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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0abc7c5db10996847c658aec5cd55f8401643a34c8163aeb2927c8aad40ccb56' 
  AND token = 'q5eghBPdbwt3FIDLjuVnLq/blVGeJuGaqH6MrMdLKGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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