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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60eed72997a135c284184a9b48fabb0d79e000259bbd57a1cc8ed7baf166e319' 
  AND token = 'OkMTjQD566tW5hrzz7G7LEjab2cFEoQmYJkvPaRD02Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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