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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fe7a0766cddda01fc4d8d5fdcaca53438c7f1654c05dfd5b51ac1aba8c2cbca' 
  AND token = 'lgSYpEepGAV7e9JoAwM49c8Nrl7JE1pJgFLwhV2Tf7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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