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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0317ec9848442ce0b4e8876c022efbed72cae36d7b2ae19534a482ca5c848cfa' 
  AND token = 'T9AqsDH44qPEdlyDLilLqVzXL/GJlySp6u9il2DtABo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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