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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03aad28aa8169e1d9d3e7e0fdc62b289a6b2c5d68b2903145dd421dd4155a0f2' 
  AND token = '5Byebr/ftrGbIgZOgX88sPfjiT/3ar1AVSuQd5ROo+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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