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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e7a8eb06792f35df17fb959adc53e52b12f00aaff00eeb812e2d632be33a5ff' 
  AND token = 'MHfX3GCxZOH1Ue12KiB+DW6krq/MXeg4YHqqTDgXxzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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