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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d8551d734c9b91f3fe1e6fbb7d80c7b4da2dba19fd5900901274fcc58ff98ca' 
  AND token = 'TRdNk9FG5e7NPF1Dg8zsBLMu6/5+qXw5WayIRcyzO2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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