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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9e13d18b00650c0ebf052656f4791ce2b32833e9b773887f3781b23d8f08ad2' 
  AND token = '7NwhumiPBCaUrHgvYpW5cPYFBcobMIYX8WbB5ra8Zg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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