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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fd41439ac5f905d724f17607a6f270fad2e3ce5338ef0bb31745c07c677f656' 
  AND token = 'hlVOBRTdatrd32ko4ewgAVNEsiVIro/vZblFdmYYHvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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