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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bb77fc11ce500d6c472a9aaaec730f94a360ee37de7833234dd0d76431fc2f9' 
  AND token = 'G7435lgIpcUTffIN2Rs+LaC9pOs+BXO3932a5FAP12E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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