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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab9a25a85d7d9135e31fb527a22f78d618c1fda95290cbc8adfd9267d8aeaf7f' 
  AND token = '5AIanAqjQOKKjxl29ZN0WVUuryQHYhEdp16pHokVbwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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