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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0de87143f8d3596a95a297ea8d184919d4e87cbfb0c56839b9b300f1a87df0b2' 
  AND token = 'dWRct2PhyPfJeeeZ7uX3LTHFAvAL+CSFDhSgkXj0hfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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