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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cea6c5189c019447ab53463f875f6ffe2ca294e43095557351518a2fe5c74ed2' 
  AND token = 'yKKgMlLNjSyuRVp5o2O3AW8nREo3muiQ2EUVnC5MeDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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