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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '586c3b5ab34da39a619c1fbc59a85268898303e906a2bfc99fa7ff96afd0e0ab' 
  AND token = 'loilJg9M1HeE8sWGXNUTVxQTZe4or4/CX6CZ80axqIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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