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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67659baf3a3075c0013a4b5f3fee3fc654eab2bc818ae600b3059fe174799f97' 
  AND token = '5WCG4eqFeOZzEPngZNGcW0FiFEPqySixAPX4Uv+T9b0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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