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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f32ee99897446714ea478478ce7f9fd7d14a6316ddbc0d1107b986477a088c4f' 
  AND token = 'LVK1TAm0vyUHtQ7taHGf21u8tkgrOOw8VZfU0N3WS6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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