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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3805300212fee6ad561c3f709279f0b747c474800bb16d64831073926077b00c' 
  AND token = 'Kkt0oUwWDYf7VoZU99ieP5RT6XCYKNt7A9QCtHM60Oc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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