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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff7b641f627fde5e650979e09b28d5715f79fdaf8a949d0f1af1620cf2542919' 
  AND token = 'pXDJUktIWdoBm7y78qfxBEnsg8K7GxNHsBIrOZFIVBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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