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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a495c594463e58885c8f4bbfe8beb3b2b0369a023640bfa6bbec9ea68ec6f6ad' 
  AND token = '4v8N/z98MJ1cOL/Z10pF4y9qGyFisvLA1KVwQIjt++4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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