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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ffbb96ee6d4dd4a0fbad11728f01ab7c9a7ecdc358ce2f11f8ece7a6408bad0' 
  AND token = 'bTcU302Urt1zLfK2SVdaigS/SzFx0z1DPksWupvVFgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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