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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa44cfd40a7fdaf73b96286acc737f35756e3df4fd934820431c323709795c18' 
  AND token = 'Zb2kswDPps5bEGqb4vlothiuFDMOb9kwrsV0YlPm99Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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