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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f75e2dbf8d2f08ab740337a66b1147d3f49ee894ecfd7b74e5cd9032d1a2ca62' 
  AND token = '/hrw2um42b538sAq3pc+KszcQchupcZSpPUavhYb5k4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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