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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ba0c13b8dc23b6b2fb2558faaf344cb515a5155ce77b3ee39d4407b791f9f45' 
  AND token = 'tNE8rbDUy9DNPyyqhyZiviORacM53wnIMSt92AUEViw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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