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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3cf080b913d099539d40c8ca8bcdddb575413816a0a2da0d2a0241a3ee6d32a' 
  AND token = 'TN9K7SPEuXs3Wl3M/F15W8MOjbiPcFQaP5Ukyn8qMXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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