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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a291e99f852edfa29acd9208422f5e4a624eb70af3e2ea8da4df1c1558494fe5' 
  AND token = 'GsiJP9IivI2JK0cThuZGL4kVNA2nwDITDEmOpJQMKTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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