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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4983c0931a6d28464c771cbd6343dd6d35947e4bc723d637f736b7269401f48' 
  AND token = 'PMOZ5V04OnoOKUmD72W334lV0w34N/XUpPPutIlEnls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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