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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd068a1888c7170b5b33c03631dc070cfe9792603c754eb575490bda31957217b' 
  AND token = 'jdiWmOhd5seKDtN1TpWVo4982UBy+gV0u9MhoC22vP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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