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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19127ad4ad0e7565758f5e427252e20716a8378dd9b7d33058dd63bb8dd36bd5' 
  AND token = 'SM0St6I783FTFZLWrkDdplOgT8fN0+ECi+Y4Cmf01t4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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