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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fb49fc1e650f5d99ede20c0df0097d900877a4a9adab93cbb2abed1b85d6002' 
  AND token = 'Hw5WTKisTWge6Jw1FKV4WCKyqACuuFWGiYBykgVo8so=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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