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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '920866ad525a30532abe8b2573e8514ca8ead7e58c46b09561aa72e2c4592210' 
  AND token = 'qCoItVLAv+jjeood2F2jKwZgxPwPbIPjt+OwPyPhYzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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