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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d188b9f1c6d66dccc82c325925c321d3de47ea69f95f99f91def9473fe7f0ac' 
  AND token = '1+k/0CRVOc+59lHv9zxQ2BoT2h/IindbMbM9rJUuVFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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