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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4101bf7f4253df3a308c4454c3eecc09c0483caa6f45d655c27fab812a2b8c6' 
  AND token = 'BNJhHwhIBtTByBUdL3Gl+NPxJHRsZ2oFySz0fPqNQu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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