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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ace0cd76971e6f5856dc36a72b160c97586bdc03e3814cfb14ad93e0d63ed2c1' 
  AND token = 'b3T996iFBo5uz5TYsXugNgBCYK/BJhIJIfQNmm7qdEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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