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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df635c06eaa69062720e2f0562e5e73f147cc689d084fc6a1925ad2c66b3d46b' 
  AND token = 'eae6wYb9/HtJoYy87WauqVbUO8/llXWXoVySQhSZVqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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