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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1318f44d9f515f0179b2f7ae252185b723ed197a7e5e261d695b09c27893058d' 
  AND token = 'Q/xQqpADrXet1MOb2fIF4BjOflT+fogpO/mo/8LlyJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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