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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '855d1fcb55902f106f05cfff495a23244509d43f3fb3db1215cea8faaf73e40f' 
  AND token = 'eacVq+sgyNYXsqizOE6PWvrZERrOGLUTyFFr/IqJ+EY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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