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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd83ef020f03f01c203746ee9b1ea78b84828bfb528e8392c171c97b6f5e3fcdf' 
  AND token = 'WX2/IfyjpkcT2n5ndgEpHocFVZOMoLNEF8jA7b2HQhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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