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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1108ef5742a99a3fdf3027e640406acb694064216d092b700a12d3bb63165b2' 
  AND token = '+DPCu/Xa+/kCiQvaKiyqgleQRsvveWiEkLl0nGhXia4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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