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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0036f447c6fee4878c14664d3a02d21a3a2ca35a162d7587ee2a3fc753d4c457' 
  AND token = 'lbWIQZoWVGJasBLHsZf6K9rYZ2abO1Gc6xGt3YgtEfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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