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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a07ba03a08992aed089c8426666fd8573d8fa5bf33d885ecdde1cec35d633dd9' 
  AND token = 'lIuXFlZpbou3WnTb7xj6saB+8BWyP3stAD6rHbdoYDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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